what present respect to Swift on wwdc 2019?

At WWDC 2019, Apple introduced Swift 5, which included several significant updates and features. Some of the key highlights were:

ABI Stability: Swift 5 introduced ABI (Application Binary Interface) stability, which means that the Swift runtime is now included in iOS, macOS, watchOS, and tvOS. This allows apps to be smaller because they no longer need to include the Swift libraries.
String Interpolation: Improvements were made to string interpolation, making it more powerful and flexible.
Result Type: A new Result type was introduced to handle success and failure cases in a more expressive way.
Raw Strings: Swift 5 added support for raw strings, allowing developers to include special characters without needing to escape them.
Dynamic Callable Types: This feature allows types to be called like functions, which is particularly useful for interoperability with dynamic languages like Python.
Memory Layout Improvements: Enhancements were made to the memory layout of Swift types, improving performance and reducing memory usage.

These updates were part of Apple's ongoing effort to make Swift a more powerful and efficient language for developers. If you have any specific questions about Swift or other topics from WWDC, feel free to ask!